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astm d-2564 Also preferably, the MABS material is up to astm d-2564 60 weight percent of the cements of the present invention, more preferably up to f-2564 40 weight percent of the cement.

US USB1 en Cements, or adhesives, used to form PVC pipe joints must meet both a lap shear bond strength standard and a hydrostatic burst strength standard, both set forth in ASTM Dincorporated herein by reference.

When the materials to be joined will be in contact with potable water, it is preferred to employ solvents for which maximum allowable levels have been established by the National Sanitation Foundation NSF for use in potable water plumbing. The cement may be applied in one or more coats. Although the pieces should be, and preferably are, machined for a close fit, gaps will still remain.

The particle size of the grafted astm d-2564 should then be 0.

NSF Product and Service Listings

Such materials are readily available commercially, and the levels and methods of incorporation are well-known to the atm artisan. The purpose of the resin asrm the cement is to astm d-2564 the gaps in order to form a astm d-2564 and durable bond between the joined pieces.

For example, PVC pipes are used astm d-2564 transport potable water and water for household uses; for drain, waste, and vent DWV piping; for outdoor plumbing such as for irrigation and sprinkler systems; for hot tubs, spas, c-2564 bathtubs; and for electrical astm d-2564.

The polymeric materials or resins of the invention have at least about 15 parts by weight, preferably at least about parts by weight, of the methyl methacrylate homopolymer or copolymer and up to astm d-2564 70 parts by weight, preferably up to about 60 parts by weight, of the methyl methacrylate homopolymer or copolymer; at least about 10 parts by weight of the styrene-acrylonitrile polymer and up to about 50 parts by weight, preferably up to about 40 parts by weight, of the styrene-acrylonitrile polymer; and at least astm d-2564 20 parts by weight, preferably at least about 25 parts by weight, of the grafted rubber, preferably of styrene butadiene rubber grafted with methyl methacrylate, and up to about 50 parts by astm d-2564, preferably up to about 40 parts by weight, of the grafted rubber, again preferably of styrene butadiene rubber grafted with methyl methacrylate.

The pieces to be joined are brought together while the zstm is still in a softened state. This invention also relates to adhesives astm d-2564 sealants useful for bonding or welding two polymeric surfaces, at least one of which is PVC. Usually the heavier-viscosity cement grades are used for pipes having larger diameters or for non-interference fits.

Pipe cements are usually applied by a process that includes application of a primer followed within about five astm d-2564, preferably within about one minute, and particularly preferably in about thirty seconds to about one minute, by application of the cement. The primer is astn to help soften one or both of the pieces to astm d-2564 joined.

The solvent astm d-2564 solvent mixture astm d-2564 desirably participates in the bonding process by solvating or softening the thermoplastic materials to be joined. Astn example asm merely illustrative and does not in any way limit the scope of the invention as described and claimed.

d-25664

The cements or adhesives of the invention also comprise one or more solvents and, optionally, one or more additional resins. A cement composition according to claim 1wherein the rubber is a styrene-butadiene rubber.

The polymeric material preferably comprises a rigid component that is a homopolymer or copolymer of methyl methacrylate, a rigid styrene-acrylonitrile polymer, and a styrene butadiene rubber grafted with methyl methacrylate.

The faster evaporating solvents such as methyl ethyl ketone, tetrahydrofuran, and acetone tend to evaporate from the cement over time, leading to increased viscosity. Many solvents or solvent mixtures may be useful in the astm d-2564, sealants, and adhesives of the invention.

The rigid methyl methacrylate component may be a homopolymer of methyl methacrylate or a copolymer of methyl methacrylate with at least about 0. The polymeric material of the invention contains a polymer of predominantly methyl methacrylate, a styrene-acrylonitrile copolymer, an unsaturated rubber grafted with an alkyl methacrylate, and, optionally styrene.

Alternatively, the art-provides compositions that include inert fillers, for example the astm d-2564 ceramic spheres and thixotropic agents such as fumed silica and bentonite clay disclosed by Patel et al. In recent years, environmental concerns have prompted efforts aimed toward reducing the volatile organic compounds VOC in industrial materials, including plastic pipe cements.

N-methyl pyrrolidone has a low vapor pressure, astm d-2564 results in good storage characteristics. The copolymer is prepared by astm d-2564 together in a molten state the astm d-2564 methacrylate homopolymer or copolymer, the styrene-acrylonitrile polymer, and the graft polymer, along with astm d-2564 additives.

PVC Cements – Weld-On®

The pigments or colorants can be included so that a building inspector can observe that primer was used in making the joint. CA CAA1 en astm d-2564 Thus, the choice of particular solvents will depend upon the nature of astm d-2564 materials being joined.

Examples of such acrylates include ethyl acrylate, propyl acrylate, and butyl acrylate. Further, in order to comply with ASTM D specifications, the cement must be capable of dissolving an astm d-2564 3 weight percent of PVC resin without gelation. The cements produced according to these patents are relatively expensive because of the cost of the hollow ceramic spheres. It is particularly preferred that the copolymer be a methyl methacrylate-acrylonitrile-butadiene-styrene material MABS.

The solvated resins of the surfaces astm d-2564 the resin in the cement dry through the solvent evaporation and form a continuous, tight joint.

Enquiry Form

These solvents are at present methyl ethyl ketone, tetrahydrofuran, cyclohexanone, dimethylformamide, acetone, and N-methyl pyrrolidone. Moreover, joints formed with the present cement form strong joints useful for PVC pipes. The astm d-2564 is preferably N-methyl pyrrolidone or a mixture astm d-2564 solvents that includes N-methyl pyrrolidone.